At this time, we don't offer the capability to add/delete pages to multi-page designs, such as Scrapbooks and Photo Albums. However, you can easily add/delete slides in our Slideshow designs, to learn how to do this, please refer to the 'Adding/Deleting Slides' section of the following article:
Most of our Scrapbook and Photo Album designs will let you add additional photos (by changing the Layout) to your existing 8/10/20 pages but you can't add or delete pages.
When you are in Design Catalog => Browse By Format => Books => Scrapbook/ Photo Albums category, you can “SORT BY” # of Photos and select the design that will let you accommodate the numbers of photos you want to add. There are several Scrapbook/ Photo Album designs that will allow you to choose a layout (Example-1-6 photos per page) which provides you with flexibility. Also please note that our slideshow designs will let you add 1-400 slides (photos) to your creation.